The Science Source, Nature Source and People Source divisions of Photo Researchers have a wide variety of stock photography topics. Not only do we have a vast collection of imagery available in our database which you can search, but we have close to a million pictures in our traditional stock photography film archive. Every day we add hundreds of new digital photographs to our web site of stock photography. Some of our most popular topics are cancer photos, medical illustrations, photos of healthcare professionals, pictures of viruses and bacteria, genetic imagery, fetal development images, osteoporosis and medical lifestyle photos.